Leather-working machine.



PATENTED FEB. '7, 1905.

A. E. L A. C. DUMKE.

LEATHER WORKING MACHINE.

APPLICATION FILED 1020.5, 1904.

3 SHEETS-SHEET 1.

www Miki #9M PATENTED FEB. '7, 1905.

A. F. & A. C. DUMKE. LEATHER WORKING MACHINE.

APPLICATION FILED DEIILB, 1904.

3 SHEETS-SHEET 2.

PATENTED FEB. 7, 1905.

A. F. & A. C. DUMKB.

LEATHER WORKING MACHINE.

. APPLIOATION FILED 1330.5, 1904.

SHEETS-SHEET 3.

UNTTED STATES Patented February '7, 19( 5.

PATENT @Finca AUGUST F. DU MKE ANI) AUGUST C. DUMKE, OF MUVAUKEE, lYlSCONSIN.

LEATHER-WORKING MACHINE.

SPECIFICATION forming part of Letters Patent No. 781,874, ,dated February 7, 1905.

Application filed December 5, 1904. Serial No. 235,514.

Be it known that we, AUGUST F. DUuiin and AUoUs'r C. DUmin, citizens of the United States, and residents of Milwaukee, in the county of Milwaukee and State of Wisconsin, have in vented certain new and useful Improvements in Leathcr-lYorking Machines; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention consists in certain peculiarities of construction and combination of parts hereinafter particularly set forth with reference to the accompanying' drawings and subsequently claimed, its object being to provide simple, economical, and efficient machines for boarding and graining leather.

Figure l of the drawings represents a side elevation of a leather boarding and graining machine in accordance with our invention, partly broken away and in section; Fig. 2., a plan view of the machine, partlgr in horizontal section; Figs. 3 and 4, transverse sectional views of said machine, respectively indicated by lines 3 3 and a in Fig. l; Fig. 5, a plan view of a fragment of the machine, and Fig. 6 a horizontal sectional'view indicated by line 6 6 in Fig. l.

Referring by letter to the drawings, A indicates lower end standards, and B longitudinal brace-beams bolted or otherwise rigidly secured to said standards to therewith form the main frame of the machine. Made fast to the standards A are angle-brackets and slabs C C are held rigid on the brackets by suitable means. Between the slabs are parallel rollers D D, that are preferably hollow and provided with heads fast on shafts E These rollers have their bearings in boxes (l, mounted on the aforesaid standards, said rollers being covered with rubber or other suitable friction material. through the bearing-boxes and have play in apertures f of the adjacent standards. A rock-shaft F is journaled in the standards A and provided with crank-arms G that extend therefrom in opposite directions. The

upper ends of the crank-arms have play in end recesses of the slab C, and a hand-lever H is pivotally connected at its inner end to A rack portion of the one of said arms.

Bolts f extend hand-lever engages an edge of a stop-andguidc bracket r/ on one of the standards A, and links /i connect the ends of the crankarms (fr (,r of the rock-shaftf with the bearing-boxes (I, the disposition of the links being such that the rollers D D are adjusted to and from each other as a result of a movement of the hand-lever, said rollers being held in adjusted position by the engagement of the rack portion of said level' with the stop edge of the bracket y aforesaid.

At one end of the machine the roller-shafts E E are fast in spur-wheels l, l, that mesh with a similar wheel J, fast on a main shaft K, for which one of the standards A and a yoke L in rigid connection therewith are provided with bearings. The main shaft is provided with loose pullcys M M for driving belts, (not shown.) but which are intended to run in opposite directions, and a clutch N on said shaft between the pulleys is controlled by a lever O in pivotal connection with said yoke. The pulleys are alternately clutched to change direction of rotation on the part of the rollers aforesaid.

Bolted or otherwise rigidly secured on the standards A are other standards A, that straddle the bearing-boxes d, and a brace-beam P is fastened at its ends to the Lipper standards, The frame aforesaid, the slabs C C', standards A', and beam P combine to constitute what'is hereinafter termed the Lstand of the machine. In tongue-and-groove sliding connection with the upper standards A are plates Q, and a centrally-apertured beam R is fastened at its ends to the plates, said plate and beam constituting' what is hereinafter termed a carriage Pressure-rolls S S/ are journaled in angle-notches i of the carriage-plates Q over the rollers D D', and a bladeT, guided in grooves of said plates, has play between the rolls. A shank 'lV of the blade has sliding engagement with the central aperture in the carriage-beam lt, and an eccentric U engages a slot in said shank. 'lhe eccentric is fast on a spindle V, for which the carriage-beam is provided with bearings, and to facilitate turning of the spindle a hand-wheel \V is rigidly secured thereon. The larriage is suspended by hangers j, that extend through end recesses IOO of the upper brace-beam P and have connection with cranks X of a rock-shaft Y, journaled in arms f of the standards A', this rockshaft being' controlled by a lever Z, fast thereon and provided with a depending pull-rod fm., that hangs in convenient reach of the operator of the machine.

The machine being' at rest, the hand-lever H is operated to spread the rollers D D apart, and the carriage is lifted to obtain clearance between the pressure-rolls S S and said rollers. A hide of leather is now laid in on the rollers and the carriage lowered, after which the eccentric U is actuated to move the blade T downward its full throw, whereby the leather is folded between the rollers D D, that are now moved toward each other by an operation of the aforesaid hand-lever to catch and hold the fold, from which said blade is withdrawn, said fold being extended below the centers of said rollers. A pulley M or M' is now clutched to drive the rollers, so as to feed the folded leather in one direction, reverse direction of feed being' had by shifting the clutch N to run the other pulley. Boarding of the leather is accomplished by running the same between the rollers when folded flesh side in, this operation serving to make said leather supple and raise the grain. To grain the leather, it is folded grain side in and run between said rollers, this operation also serving to supple said leather, on which the pressure-rolls' S S have automatic yield to inequalities of thickness.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

l. A leather-working machine comprisinga stand, a pair of parallel friction-rollers, a vertically-adjustable carriage, pressure-rolls with the carriage over the rollers, a blade in vertically-adjustable connection with said carriage between the pressure-rolls, and means for driving said rollers.

2. A leather-working machine comprising a stand, a pair of parallel friction-rollers, reversible driving-gear for the rollers, a vertically-adjustable carriage, pressure-rolls with the carriage over said rollers, and a blade in vertically-adjustable connection with said carriage between the pressure-rolls.

8. A leather-working machine comprising a stand, bearing-boxes in pairs adjustable to and from each other on the stand, a pair of -parallel friction-rollers having the journals or shafts thereof engaging said boxes, drivinggear for the rollers, a vertically-adjustable carriage, pressure-rolls with the carriage over said rollers, and a blade in vertically-adjustable connection with said carriage between the pressure-rolls.

4. A leather-working machine comprising a stand, bearing-boxes in pairs adjustable to and from each other on the stand, a pair of parallel friction-rollers havingthe journals or shafts thereof engaging said boxes, reversible driving-gear for the rollers, a vertically-adjustable carriage, pressure-rolls with the carriage over said rollers, and a blade in vertically-adjustable connection with said carriage between the pressure-rolls.

5. A leather-working machine comprising a stand, bearing-boxes in pairs movable on the stand, a rock-shaft provided with crank-arms, in link connection with the bearing-boxes, the disposition of the links being such that said boxes in each pair are moved to or from each other by an operation of the rock-shaft; a hand-lever in connection with one of the rock-shaft arms, means for holding the lever in adjusted position, a pair'of parallel frictionrollers, the journals or shafts of which engage said boxes, means for driving the rollers, a vertically-adjustable carriage, pressure-rolls with the carriage over said rollers, and a blade in vertically-adjustable connection with said carriage between the pressure-rolls.

6. A leather-working machine comprising a stand, a pair of parallel friction-rollers, means for driving the rollers, a verticallyadjustable carriage. pressure-rolls with the carriage over the rollers, a blade guided in vertical grooves of said carriage between the pressure-rolls, and an eccentric with the aforesaid carriage engaging a slot in a shank of the blade.

7. A leather-working machine comprising a stand, a pair of parallel friction-rollers, means for driving' the rollers, a verticallyadjustable carriage having an apertured beam, pressure -rolls with the carriage over the rollers, a blade guided in vertical grooves of said carriage between the pressure-rolls and having a slotted shank engaging the beamaperture, a spindle for which the beam is provided with bearings, and an eccentric on the spindle engaging the blade-shank slot.

8. A leather-working machine comprising a stand, a pair of parallel friction-rollers, means for driving the rollers, a carriage in vertical sliding connection with the stand, a lever controlled rock -shaft provided with cranks, hangers connecting the carriage and cranks, pressure-rolls with said carriage over the rollers, and a blade in vertical adjustable connection with the aforesaid carriage between the pressure-rolls.

In testimony that we claim the foregoing we have hereunto set our hands, at Milwaukee, in the county of Milwaukee and State of Wisconsin, in the presence of two witnesses.

AUGUST F. DUMKE. A. C. DUMKE Vitnesses:

H. E. OLIPHANT, GEORGE FELBER.

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